Caption: Under a cloud of MLW smoke from the trailing FPA2, The Canadian (#12) heads south after passing through Woodbridge, crossing over the Humber River bridge on Canadian Pacific's MacTier Sub. The train is approaching the white "Emery" mileboard sign, and the CN Halton Sub overpass northwest of Islington and Steeles from which this photo was taken. Sprawling farmer's fields line the right-of-way on both sides (with a private farm crossing a little further behind the rear "Park" dome-observation car).

The curve in the distance and Humber River bridge were part of the re-alignment of CP's MacTier Sub that took place circa 1907. The original Toronto, Grey & Bruce line curved through the valley of the river below, came to grade around the curve in the distance, and continued to Woodbridge on a more western alignment. The old Toronto Suburban Railway radial line from Weston to Woodbridge once ran through this area following the Humber River north, and also crossed below this bridge.

Today the MacTier Sub remains a busy CP freight corridor between Toronto and western Canada, but under VIA operation The Canadian was long ago shifted to CN routing in the southern Ontario area. Highway 407 ETR currently runs through the foreground of the photo parallel to CN's Halton Sub.